Method of removing asphalt-resinous and paraffin-hydrate deposits from wells and a method of manufacturing granules of alkali metal, placed in an insulating capsule

 

(57) Abstract:

The invention relates to the field of oil and gas production, and is intended for cleaning wells (pipe columns) from asphalt-resinous and paraffin-hydrate deposits (ASPHO) generated during operation of the wells. In the well impose a suspension of the alkali metal in the form of granules, placed in a fusible insulating capsule. Pellets are produced by introducing into the molten alkaline metal particles of weighting. These grains become centers of crystallization of the pellets during cooling of the metal during its mixing. Make pellets, placed in capsules with different parameters. The use of such granules allows you to enter the alkali metal in contact with water, ensuring optimal heat transfer thermochemical reaction in the whole interval of the distribution zone ASPHO, achieving its maximum efficiency. The technical result is a simplification of the manufacture of granules, increasing the efficiency of removal ASPHO. 2 C. and 14 C.p. f-crystals.

The invention relates to the field of oil and gas production, and is intended for cleaning wells (pipe columns) from asphalt - resinous and paraffin-hydrate deposits (TSA the paraffin-hydrated sediments from the borehole, including the destruction of ASPHO by filing in the borehole of an alkali metal in a protective tool. Alkali metal represents the variance. As a protective agent used in the dispersion medium is dehydrated hydrocarbon liquid. The alkali metal is introduced into contact with water, which is served in the well after squeezing the liquid. Occurs thermochemical reaction zone ASPHO with evolution of heat, which melts ASPHO. Melted fat out of the wells of the displacing fluid (RF patent N 2028447, E 21 In 37/06, 1995).

The known method has drawbacks:

- the proportion of the alkali metal (Li, K, Na) less than 0,5; 0,86; and 0.98, respectively), and this means that in water they do not sink;

- specific surface of a substance in a certain volume or unit mass depends on the size of the particles, i.e., the surface of the piece, for example, Na mass 1 kg is many times less than the surface 1 kg of the same Na, presents dispersion (particle size of 0.3 - 3 mm), so the area is expected thermomechanical response increases, which will lead to rapid uncontrollable reaction particles unprotected metal and not necessarily in the area where there are ASPHO. The probability of Burmistrova method involves the use of a large amount of dehydrated hydrocarbon fluids (oil, kerosene, a mixture thereof), which, as the dispersion medium (protective agent) is injected into the well to deliver an alkali metal in the area ASPHO;

in the case of a bundle of well fluid to the hydrocarbon liquid (oil) and water alkaline metal in the oil will go down, because it is heavier than her and focused on the surface of the water because its specific gravity less than the specific gravity of water. The result is that the reaction will occur at the interface of oil and water, but not necessarily in the area ASPHO;

sequential injection of the alkali metal in the dehydrated hydrocarbon liquid, squeezing the liquid (hydrocarbon dehydrated liquid or water and, finally, the displacing fluid (hydrocarbon fluid) can cause alkaline metal will not be able to come into contact with water, and is washed to the surface in the medium of hydrocarbon liquids;

- the process of removing ASPHO in accordance with the known method does not control, is not controllable and not very effective.

The objective of the invention is to obtain a technical result, which may result in creating an efficient method of destruction and removal ASPHO from wells on the basis of control and management is encouraged by the fact that a method for removal of asphalt-tar and paraffin-getaneh sediments (ASPHO) from the well, including the destruction of ASPHO by filing in the well of the alkali metal in the protective means and the introduction of the alkali metal in contact with water to obtain thermochemical reaction zone ASPHO and leaching molten ASPHO from the well, use the alkali metal to the form of granules, as a protective agent used fusible insulating capsule that holds the pellets, with pre-defined interval distribution zone ASPHO well, then determine the required number and parameters of granules of alkali metal, placed in a fusible insulating capsules, the parameters of insulating capsules, and the introduction of the alkali metal in contact with water is carried out by providing optimal heat transfer thermochemical reaction in the whole interval of the distribution zone ASPHO.

In one of the private cases thermochemical reaction localize and promote along the interval distribution zone ASPHO, using pellets of alkali metal, placed in a fusible insulating capsules with the same settings.

In another castle rassridotachivaytes along the interval distribution zone ASPHO and introduce alkali metal granules in contact with water at the same time along the whole interval distribution ASPHO, using pellets of alkali metal, placed in a fusible insulating capsules with different parameters.

As parameters of granules of alkali metal usually use their mass, density, thickness of fusible insulating capsule and geometrical dimensions.

For education thermochemical reactions use water contained in the well fluid, and/or water, which is served in the well from the surface.

A known method of manufacturing granules of alkali metal, placed in an insulating capsule, including the introduction of a weighting agent and forming an insulating capsules. Isolating capsules are usually made from aluminum, zinc in the form of a foil with a water-repellent coating. Weighting is applied in conjunction with bitumen or grease on the surface of the insulating capsules. Granules of alkali metal is produced by extrusion and placed in isolation capsule. As the weighting applied soluble in oil and/or water metal salts or sand or fine metal, such as iron, lead (see the patent of Russian Federation N 2122628, E 21 In 37/06, 1998).

A disadvantage of the known method of manufacturing Gran the bone in subsequent use, because before introducing them into the well it is necessary to violate the integrity of their insulating capsules.

The technical result of the claimed method of manufacturing granules of alkali metal, placed in an insulating capsule, is the simplification of manufacturing technology, allowing you to get the party granules of alkali metal, placed in an insulating capsule, with different parameters, which reduces the cost of production and can be used to create controlled and managed by thermochemical reaction in the interval zone distribution ASPHO in the well.

The technical result in the method of manufacturing granules of alkali metal, placed in an insulating capsule, including the introduction of a weighting agent and forming an insulating capsules according to the invention is achieved by the fact that the introduction of weighting is carried out in a molten alkali metal, used for weighting in the form of particles, which form the centers of crystallization of the pellets during cooling of the molten alkali metal in the process of mixing in the bath filled with hydrocarbon medium, and isolating capsules form fusible.

Contributes to achieving the Ute paraffin, and as the alkali metal, mainly used sodium.

Suitable as a filler to be used primarily barite or ultrafine iron.

As a bath in which is stirred during cooling of the molten alkali metal, can be used magnetic stirrer or mixer.

Preferably the formation of fusible insulating capsules be done by coagulation of the obtained granules of alkali metal in the environment, paraffin, bitumen, dehydrated mineral oil or rosin, it is reasonable that the thickness of their walls was not less than 0.02 mm, and the form - in the form of balls with a diameter of not less than 0.2 mm

A method of manufacturing granules of alkali metal, placed in an insulating capsule, as follows.

In the molten alkaline metal such as sodium (Na), introducing a weighting agent such as barite (BaSO4), or ultrafine iron. The weighting agent is administered in the form of particles, which form the centers of crystallization of the pellets during cooling of the molten alkali metal in the process of mixing. Since the melting of the alkali metal is in the tub filled with hydrocarbon environment (Ola) of the said metal in the form of balls with the inclusion of weighting. The sizes of the balls depends on the speed of mixing and the amount of weighting agent, and their share from the characteristics of the weighting. As a bath in which is stirred during cooling of the molten alkaline metal, use a magnetic stirrer or mixer. The cooled pellets are placed in the dehydrated hydrocarbon liquid.

The formation of fusible insulating capsules produced by coagulation of the obtained granules in the environment, paraffin, bitumen, dehydrated mineral oil or rosin. Ensure that the wall thickness of the capsule was not less than 0.02 mm, and their shape is close to spherical. The diameter of the capsules-balls must be not less than 0.2 mm, Thus, placed in a capsule in the form of granules of alkali metal is protected from the instant the impact of water flow into the well. Obviously the technology of manufacturing granules of alkali metal, placed in an insulating capsule, allows you to produce them with various options. In particular, can be made of the party of granules placed in a fusible insulating capsules with different geometrical dimensions, weight, mass, wall thickness of fusible insulating capsules, material capsules.

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Destruction ASPHO carried out by feeding into the well of the alkali metal in the protective means, removal of the protective means and the introduction of the alkali metal in contact with water. The result is a thermochemical reaction zone ASPHO, generates heat, which ASPHO melted and then washed out of the well.

To achieve maximum destruction efficiency ASPHO it is necessary to ensure the feasibility of several interrelated processes:

the movement of the granules of alkali metal in the insulating capsules in the area ASPHO;

the destruction of the walls of the insulating capsules;

- the process of thermo-chemical reactions and heat and mass transfer.

Ensuring the feasibility of these interrelated processes related to the variation parameter granules of alkali metal and insulating walls of the capsules.

Before processing a specific wells pre-determine the parameters of granules of alkali metal and parameters of the walls of the fusible insulating capsules. These parameters depend on the characteristics of the well fluid, the depth distribution zone ASPHO, gas factor. These characteristics are determined by known technical for Westlaw by several interdependent equations:

- the equations of motion of capsules containing granules in the environment of the well fluid before the moment of destruction;

- the equations of the mechanical destruction of the capsules in the process of movement, uniting the total effect of dissipative forces on the change in the wall thickness of the capsule;

- equations of thermo-chemical reactions and heat and mass transfer.

Using the mentioned dependencies and mathematical software. you can determine (calculate) the optimal parameters of granules of alkali metal and settings insulating capsules to achieve their zone ASPHO or zones ASPHO the specific well. This is done by a computer program that provides an operational definition of the parameters of insulating capsules and granules, their movement speeds in a particular well, the time of the destruction of the insulating capsules.

Thus, it is possible to calculate the required weight of the alkali metal, the possible number of released reaction heat for specific conditions (watering, spacing, and character ASPHO) when using granules of alkali metal, placed in a fusible insulating capsules with certain parameters. This in turn allows by combining razlichnyei with different parameters to regulate and control thermochemical reaction with optimal teplomassoobmena in the entire interval of destruction ASPHO, i.e., to achieve its maximum efficiency.

When using granules of alkali metal, placed in a fusible insulating capsules with the same parameters as suspensions are served at the well, at the estimated depth of almost everything will come into contact with water contained in the well fluid or pumped from the surface, for example, in the structure of the suspension. Since this estimated depth will occur thermochemical reaction with the maximum temperature.

Knowing the estimated velocity of the granules until contact their alkali metal with water and the passage of thermochemical reaction, it is possible to impose the maximum reaction temperature to the range of the distribution zone ASPHO. The simultaneous introduction of the alkali metal in contact with water is due to the fact that the capsule as a result of collisions with each other, the walls of the pipe columns, the effects of hydrostatic fluid pressure, chemical action of the liquid suspension almost simultaneously will collapse. This is ony ASPHO. Obviously so you can destroy and remove ASPHO from a small interval of the distribution zone ASPHO, ensuring optimum heat transfer.

For large intervals of the distribution area ASPHO use granules of alkali metal, placed in a fusible insulating capsules with different parameters. Combining party with different parameters of granules placed in capsules in the required quantity, rassridotachivaytes along the interval distribution ASPHO. The design depth of the alkali metal of each batch of pellets will be almost simultaneously come into contact with water, because the violation of the integrity of membranes the main mass of each batch of capsules will be on pre-calculated depth effect of the previously mentioned reasons. In this case it appears as if several thermochemical reactions, the maximum heat which will be dispersed on the well depth, which allows, in essence, almost along the whole interval distribution zone ASPHO simultaneously to enter the alkali metal in contact with water and to obtain the optimal heat and mass transfer from thermochemical reactions in the entire interval distribution zone ASPHO with an average Proc. of the tube space of the borehole to the surface of preparing a suspension with the necessary parameters of the liquid phase and solid (granules in capsules) phase.

The suspension is prepared as injection hole of the liquid phase by injecting pellets of alkali metal, placed in a fusible insulating capsules.

After injection of the required amount of suspension make the holding pressure on the local thermochemical reactions in the selected interval, if the specific gravity of the granules close to the specific weight of the liquid phase. Son-in-law open tube space and wash molten ASPHO pump or backwashing.

If the specific gravity of the granules is less than or greater than the specific weight of the liquid phase of the suspension, after localization thermochemical reaction in its advance up or down along the interval distribution zone ASPHO with direct or back washing, then wash molten ASPHO.

The use of the invention reduces costs, simplifies the technology of manufacturing granules of alkali metal, placed in a fusible insulating capsules, lets get this party with different parameters, which in turn allows their use to be a controlled and managed by thermochemical reaction with optimal teplomassoobmena in the interval zone distribution is estimated and paraffin-hydrate deposits (ASPHO) from a well comprising the destruction ASPHO by filing in the well of the alkali metal in the protective means and the introduction of the alkali metal in contact with water to obtain thermochemical reaction zone ASPHO, and leaching the fused ASPHO from a well, characterized in that the use of alkali metal in the form of granules, as a protective agent used fusible insulating capsule in which is placed granules, with pre-defined interval distribution zone ASPHO well, then determine the required number and parameters of granules of alkali metal, placed in a fusible insulating capsule, the parameters of insulating capsules, and the introduction of the alkali metal in contact with water is carried out by providing optimal heat transfer thermochemical reaction in the whole interval of the distribution zone ASPHO.

2. The method according to p. 1, wherein thermochemical reaction localize and promote along the interval distribution zone ASPHO.

3. The method according to p. 1, characterized in that the granules of alkali metal, placed in a fusible insulating capsule in the required amount rassridotachivaytes along the interval distribution zone ASPHO and introduce alkali metal granules in contact with water at the same time along the whole interval distribution zone ASPHO.

4. The method according to p. 2, characterized in that the use of alkaline granules of p. 3, characterized in that use pellets of alkali metal, placed in a fusible insulating capsules with different parameters.

6. The method according to one of paragraphs.4 and 5, characterized in that the quality parameters of granules of alkali metal use their mass, density, thickness of fusible insulating capsule, the insulating material of the capsule and geometrical dimensions.

7. The method according to one of paragraphs.1-6, characterized in that use water contained in the well fluid.

8. The method according to one of paragraphs.1-6, characterized in that use water, which is served in the well from the surface.

9. A method of manufacturing granules of alkali metal, placed in an insulating capsule, including the introduction of a weighting agent and forming an insulating capsules, characterized in that the introduction of weighting is carried out in a molten alkali metal, used for weighting in the form of particles, which form the centers of crystallization of the pellets during cooling of the molten alkali metal in the process of mixing in the bath filled hydrocarbon medium, and isolating capsules form fusible.

10. The method according to p. 9, characterized in that the ka, as a weighting agent used mainly barite or ultrafine iron.

12. The method according to p. 9, characterized in that the quality of an alkali metal, mainly used sodium.

13. The method according to p. 9, characterized in that as the bath, which was stirred during cooling of the molten alkaline metal, use a magnetic stirrer or mixer.

14. The method according to p. 9, characterized in that the form of fusible insulating capsules by coagulation of the obtained granules of alkali metal in the environment, paraffin, bitumen, dehydrated mineral oil or rosin.

15. The method according to p. 14, characterized in that the form of fusible insulating capsules with a wall thickness of not less than 0.02 mm

16. The method according to p. 15. characterized in that the granules of alkali metal, placed in a fusible insulating capsules, have the form of balls with a diameter of not less than 0.2 mm

 

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EFFECT: lower costs.

3 dwg

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